Duel Mass Flywheel knocking.....

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MarkTweedley

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Hi all, recently found out that my duel mass flywheel is knocking and then found out how pricey it is to replace along with clutch, slave cylinder and relevant gaskets etc.

Just wondering if it's worth doing the single flywheel conversion??? I've heard it's stronger and unlikely to fail, however, I have also heard that the drive is not as smooth, (for obvious reasons), and wondered how noticeable this would be and if there are any other implications?

Could anybody please advise from their experiences?

Many thanks,

Mark
 
I have smf, first thing to point out is that its noisey on idle, but normal when engaged. Its lighter than dmf so acceleration is faster, less weight mean less stress on other parts which means it can then handle more torque :) also less likely to fail. Audi dmf are rubbish, even in my mates rs4 b7 it failed!
 
How much louder is it, is it something others notice because i too need to change mine.
Finally how much was it?
 
Thanks all, think I might go with this option!

@ Backdraft Motorsport - I believe you supply the garage I use, Lincoln VW Specialists, Andy rates you very highly.
 
I suppose I should mention that mine is a2.0 TDI Sport 140. Does anyone or can anyone advise on how much and which parts I need to do the smf conversion please?

Thanks
 
MarkTweedley said:
I suppose I should mention that mine is a2.0 TDI Sport 140. Does anyone or can anyone advise on how much and which parts I need to do the smf conversion please?

Thanks
Click to expand...

If you can tell me your engine code I will check to see what is available for you. And yes we supply Andy and Co from time to time. Always a pleasure ;).
 
Good news, there is a clutch and lightened flywheel for you car... this kit will fit the following 2.0TDi engine codes... AZV/BKD/BMM

The kit includes...
Clutch cover plate
'Organic' sprung drive plate
Release bearing
Single mass flywheel

Clutch kit can handle 349 Lb/ft (475 NM) torque.

£759 + vat with free delivery to U.K address.
 
Backdraft Motorsport said:
If you need any more info please just ask...
Click to expand...

Is there a greater risk of the crank failing with an SMF over a DMF? I assume the DMF is used by Audi to remove vibration, but wondered whether this is for the benefit of the driver / passengers comfort, the longevity of the crank / running gear, or both (or it maybe another one of those urban myths!).

I'm going to have to change mine in the near future, and am unsure as to which route to take.
 
The DMF is designed to mask the noise and vibration through the gearbox. If you fit the SMF the noise and vibration is no longer masked, which is why you get the rattle. The SMF will have no detrimental effect on the crank or any other working parts. It's just a little louder.

After speaking to Helix they told me that dual mass flywheels are only good for about 300ft/lb (400NM).
 
Backdraft Motorsport said:
After speaking to Helix they told me that dual mass flywheels are only good for about 300ft/lb (400NM).
Click to expand...

Hmmm, that's not good as I guess I must be pushing close to 100lb/ft more than that with Stg2+.

I've noticed a significant drop off recently in the urgency of acceleration, and particularly now it's colder the clutch feels almost sticky when running cold (probably due to the master cylinder). Also the higher the revs get, there is also the sensation of the slightest vibration through the car, and it's not wheel balancing as I've had them done twice, and even changed wheels.

Car has done 45k miles total, and 34k since a it's last clutch / flywheel change at Audi in 2008 (Audi also had to replace the rear diff at same time as it was whining and leaking).

What does it cost / how long does it take for you guys to fit a new SMF / Helix clutch (+ master cylinder & release bearing) on a 2007 S3 2.0TFSi?
 
I would recommend the stage 3 clutch kit as shown in this thread

That clutch kit inc SMF is £825 + vat. That also includes a new release bearing/slave cylinder.
Labour and alignment would come to £425 + vat

Master cylinder is aprox £60 + vat for the genuine Audi part.
Would fit that FOC as a nice little sweetener for you, if you went for it all.

The work would take the best part of a day.
 
Thanks Backdraft, great info there. I assume they are all performance parts you have listed? It does make sense to have the best parts but i'll be on a real tight budget and wondering if these parts can be sourced within the everyday range rather than performance parts?

Thanks again!

Mark
 
audi upgrades
Hi Mark. Yes these are all aftermarket performance parts and audi dont do a SMF unfortunatly. I have spoke to Helix since your last post and I have been told the SMF are quite loud on diesel applications, so unless your looking for absolute performance it may not be the best option after all.
 
SMF rattle a lot more on diesel cars then petrol due to the harmonics of the diesel engine. Lighter the flywheel more rattle you get. Putting very thick gearbox oil in the gearbox helps deaden the sound and raising the idle rpm a few hundred helps as well especially on the PD140 BKD engine which has a ruff idle to start with.
 
navnayyar said:
. Its lighter than dmf so acceleration is faster, less weight mean less stress on other parts which means it can then handle more torque :)
Click to expand...
Sorry mate but you have that wrong. With a lighter flywheel you are putting more stress on the rest of the drive train as the power from the engine can be converted into rotational mass quicker which is why the car accelerates faster. An important thing to point out with low revving diesel engines is the weight of the flywheel helps to keep the transmission spinning when you take your foot off the throttle to change gear etc. With high revving petrol engines this doesn`t make so much difference but with a low revving diesel this can sometimes be an issue.
 
Think I'm going with a complete Sachs kit I've seen on Ebay for £519 and I have a mechanic that will fit it all for £110 which I think is very reasonable.

The only thing i'm now wondering is that I've seen a couple of things saying that it depends on if my car was originally fitted with a Lucas or Sachs DMF etc from factory??? I fail to see why this makes a difference, can anybody explain please?

Thanks again folks!
 
Im having problems with my Sachs clutch kit which has been fitted with a brand new LUK DMF, although the parts should all be correct. being investigated as we speak
 
That's a major headache one part replacement leads to all parts replacement! Some cars are just meant to be that way - I hate it.

Shock Absorber and Strut Assembly|Suspension Block|Power Steering Pump|Seat Cover|Tonneau Cover|Driveshaft|Flywheel
 
My flywheel went but i got it all repaired for 5oquid with an aftermarket warranty. I was looking into the SMF route, but i was told with the DSG and BKD engine there was only the DMF available.

Do you have DSG ?
 
navnayyar said:
I have smf, first thing to point out is that its noisey on idle, but normal when engaged. Its lighter than dmf so acceleration is faster, less weight mean less stress on other parts which means it can then handle more torque :) also less likely to fail. Audi dmf are rubbish, even in my mates rs4 b7 it failed!
Click to expand...

Sorry but your incorrect about the less weight means less stress part. The increased weight of the OEM DMF has a huge dampening effect which helps reduce vibrations throughout the drivetrain and crankshaft at higher rpms, fitting a lightweight flywheel actually puts more stress on the rest of the drivetrain.
 
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